Planned to be enforced on December 1, 2017, the standard aims to reduce the city's vehicle emissions pollution by 20 to 30 percent by 2022..

Gasoline standards in Beijing have always been one or two stages ahead of other Chinese cities, according to the city's Environmental Protection Bureau.

Beijing took the lead in China in using unleaded gasoline in 2007 and worked out Beijing II gasoline standard in 2004. Later in 2005, 2008 and 2012, Beijing issued and implemented Beijing III, Beijing IV and Beijing V gasoline standards.

Image: BWPI

With the enforcement of Beijing VI, the vehicle hydrocarbon emissions will also be cut down by 5 percent.